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I would get a tank divider or a second tank. They may seem peaceful now but once the male decides he is ready to mate he will harrass the female until she dies. It might happen really quickly too so you might not be able to save her.

I slid a divider between them, I have a 10 gal rectangular aquarium and a suitable filter system for a 10 gal. slightly modified to reduce current, before that I observed them today and the female was like bugging him and turning he body like at an angle of almost 80 degrees Nd kinda swimming into him sideways, idk what this means but I don't have a clue what she's thinking. and now he wants nothing to do with her but was never aggressive